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/*
* Atmel AT91RM9200 Interrupt handler
*
* Copyright (c) 2004 by Jay Monkman <jtm@lopgindog.com>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
*
* http://www.rtems.com/license/LICENSE.
*
*
* $Id$
*/
#define __asm__
.globl bsp_interrupt_dispatch
bsp_interrupt_dispatch :
/*
* Look at interrupt status register to determine source.
* From source, determine offset into expanded vector table
* and load vector into r0 and handler address into r1.
*/
ldr r0, =0xFFFFF100 /* AIC_CTL_BASE + AIC_IVR */
ldr r1, [r0]
str r1, [r0] /* write back in case we are using protect */
ldr r0, =0xFFFFF108 /* AIC_CTL_BASE + AIC_ISR */
ldr r0, [r0] /* Read interrupt vector */
stmdb sp!,{lr}
ldr lr, =IRQ_return /* prepare the return from handler */
mov pc, r1 /* execute handler */
IRQ_return:
ldr r2, =0xFFFFF130 /* AIC_CTL_BASE + AIC_EIOCR */
str r1, [r2]
ldmia sp!,{lr}
mov pc, lr
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